The invisible decay of cold dark matter into a slightly lighter dark sector particle on cosmological time-scales has been proposed as a solution to the $S_8$ tension. In this work we discuss the possible embedding of this scenario within a particle physics framework, and we investigate its phenomenology. We identify a minimal dark matter decay setup that addresses the $S_8$ tension, while...
The comparable abundances of dark matter and baryons urge for an explanation that relates the dark sector to the QCD sector. In Asymmetric Dark Matter models, the number densities of both sectors are naturally similar. However, a complete solution should also include a mechanism for comparable masses. In this talk, I will present a new solution where the dark matter mass is generated by the...
Axion-like particles (ALPs), the pseudo Nambu-goldstone bosons arising from the spontaneous breaking of global symmetry, are promising candidates for dark matter. The most extensively studied ALP production mechanism is known as the misalignment mechanism, where ALP is presumed to remain frozen at a point in the field space until it begins oscillating around the potential minimum and behaves...
In this talk we scrutinize the Sommerfeld enhancement in dark matter pair annihilation for $p$-wave and higher-$\ell$ partial waves. For the Yukawa potential these feature a super-resonant Breit-Wigner peak in their velocity-dependence close to Sommerfeld resonances as well as a universal scaling with velocity for all $\ell\geq 1$ that differs from the $s$-wave case.
We provide a quantum...
I will show the collinear splitting effects of boosted dark matter at detection experiments based on simplified models. In particular, based on the dark photon model, the observation of Cosmic ray induced boosted DM at neutrino detectors with high energy thresholds will be modified by the initial state radiation(DM PDF). In addition, based on two-component DM models, the dark parton showering...
The isomer transition of Th-229 has recently been excited for the first time by a VUV laser and subsequently the transition energy has been determined with a relative error of $O(10^{-6})$ (by now even $O(10^{-10})$). Due to its enhanced sensitivity to scalars coupling to the nuclear sector compared to other optical clocks, measurements of the lineshape will soon start probing uncharted...
We explore direct detection constraints on the anapole form factors of massive spin-3/2 Majorana dark matter particle. From supergravity, the gravitino naturally emerges as a candidate. We calculate the anapole form factors of the LSP gravitino in N = 1 broken supergravity, analyzing their dependence on the parameters of the theory and evaluating the prospects for its direct...
We present a detailed study of the precision calculations of higher-order contributions to effective potential with the application of three-dimensional effective field theories (3D EFTs). Our work focuses on the thermodynamic quantification and description of electroweak phase transitions in the early Universe for the complex singlet extended Standard Model (cxSM). In particular, we address...
Electroweak Precision Measurements are stringent tests of the Standard Model and sensitive probes to New Physics. Accurate studies of the Z-boson couplings to the first-generation quarks could reveal potential discrepancies between the fundamental theory and experimental data. Future e+e- colliders offering high statistics of Z bosons would be an excellent tool to perform such a measurement...
Small instantons can increase the axion mass, due to an appropriate modification of QCD in the ultraviolet (UV), in a way where the axion still solves the strong CP problem. However, if any CP violation is present in UV theories where small instanton effects are enhanced, the minimum of the axion potential will be shifted, destroying the axion solution strong CP problem. In this talk, I will...
